Adjustable wear-plate for sewing-machine heads.



J. M. CHADWICK.

ADJUSTABLE WEAR PLATE FOR SEWING MACHlNE HEADS.

APPLICATION HLED SEPT- 4, I9l5.

0% 1 9 1 Km 2 v p A d m n B t 3 P JOHN M. CHADWIGK, OF DAYTON, OHIO.

Specification of Letters Patent.

Patented Apr. 25, 1916.

Application filed September 4, 1915. Serial No. 49,09

To all whom it may concern:

Be it known that I, JOHN M. CHADWIGK, citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented new and useful Improvements in Adjustable Wear- Plates for Sewing-Machine Heads, of which the following is a specification.

The invention relates to an improvement in sewing machine heads and particularly to a means for providing a cross bar constructed with a view to permitting its convenient adjustment to the head and for taking up wear in the operation of the parts.

The improvement contemplates a cross bar overlying the needle and feed bar and formed with an offset to provide a guide proper to receive a hardened wear plate to contact with the feed bar and needle bar and provided with a lock screw, the wear plate being adjustably connected to the cross bar by screws to permit the taking up of wear.

The invention in the preferred form of details will be described in the following specification, reference being had particularly to the accompanying drawings, in

which Figure 1 is a perspective view partly broken out of the machine head illustrating the application thereto of my improved cross bar; Fig. 2 is a perspective view of the cross bar proper.

In the application of my improvement the end of the machine. in the form of the usual hollow box like casing 1 is recessed. at 2 at the respective ends to provide the usual p: ssage for the feed bar and needle bar. The walls 8 with which the recesses 2 are formed are further reduced in height for a portion of their widths providing a bearing 4-. The improved cross bar is applied to this hearing and comprises a strip like element corresponding in dimensions with the cut away portion of the wall so as to in effect co1n-- plete said wall in applied position. The strip 5 is centrally provided with an offset in the form of a hollow box like projec tion 6 open at the ends, and having a longi tudinal dimension. corresponding to the recess 2 so that when applied this box like portion extends through the recess to overlie the feed bar 7 and needle bar 8. Loosely fitting in the box like projection 6 is a hardened steel plate 9 held in said box like member by a screw 10 threaded into the wear plate 9 and passing loosely through an opening in the strip 5 so as to be operative from the upper or face side of said strip. Adjusting screws 11. are threaded through the strip 5 and bear at their lower ends against the upper or inner face of the wear plate, these screws 11 being preferably positioned on opposite sides of the screw 10, which latter serves as a lock screw as will later appear. The cross bar is applied to the head by seating the same in the cut away portion of the walls, screws 12 removably fastening the cross bar in place.

In use it is obvious that the contact is between the wear plate and feed bar and nee dle bar, and that the wear plate may be readily and conveniently adjusted to secure desired guiding operation by manipulation of the screws 11, the screw 10 being then tightened to lock the wear plate in such adjusted relation.

By the improved cross bar I am enabled to provide a means in which the desired ad justment can be secured and a comparatively small part of the bar made of hardened steel in order to insure a proper wearing action in the sliding contact described. The arrangement of the cross bar provides for convenient adjustment of this part to secure any desired efliciency.

What is claimed is:

1. A cross bar for machine heads, a wear plate loosely arranged therein, means for adjusting the wear plate with relation to the cross bar, and means for locking the wear plate in adjusted position. 7

2. A cross bar having a box like projection to overlie the needle bar and feed bar of a sewing machine head, a wear plate loosely arranged in said box like projection. screws threaded through the cross bar and bearing on the wear plate and a lock screw passing loosely through the cross bar and having threaded connection with the wear plate.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN M. CHAD NIOK.

Witnesses:

FRANK W. HOWELL, HENRY J EYES.

topics at this patent may be obtained for five cents each, by addressing the Uommissioner of Patents, Washington, ID. G. 

